Re: [Xen-devel] [PATCH 2/2] x86/microcode: enable boot time (pre-Dom0) loading

[Keir Fraser <keir.xen@xxxxxxxxx>]

On 30/11/2011 16:27, "Jan Beulich" <JBeulich@xxxxxxxx> wrote:

> 
> In order to not convert the spin_lock() in microcode_update_cpu() (and
> then obviously also all other uses on microcode_mutex) to
> spin_lock_irqsave() (which would be undesirable for the hypercall
> context in which the function also runs), the boot time handling gets
> done using a tasklet (instead of using on_selected_cpus()).

Can you explain this some more? Why would the conversion to
spin_lock_irqsave be required when spin_lock is sufficient for current usage
from dom0 hypercall?

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel